Rockland Lake State Park is a 1,133-acre state park located in the hamlets of Congers and Valley Cottage in the eastern part of the Town of Clarkstown in Rockland County, New York, United States. The park is located on a ridge of Hook Mountain above the west bank of the Hudson River. Included within the park is the 256-acre Rockland Lake. Development of the park as part of the Palisades Interstate Park system began in 1958.